Monsoon in Rajasthan (July-September) The climate of Rajasthan varies from arid to sub-humid as it is situated in the desert area. The west of Aravallis receives low rainfall, low humidity and high velocity winds annually. Whereas, the east of Aravallis enjoys low velocity wind with high humidity and much better rainfall.   The north-west part of Jaisalmer receives an annual rainfall less than 10 cm, the regions of Bikaner, Ganganagar and Barmer enjoys 20 to 30 cm of annual rainfall whereas, Nagaur, Churu, Jodhpur and Jalor gets 30 to 40 cm while more than 40 cm of annual rainfall is received in Jhunjhunun, Sikar, Pali and the western suburbs of the Aravalli range. The eastern part of the Aravallis like Ajmer gets 55 cm of annual rainfall to 102 cm in Jhalawar.   The southwestern region of Sirohi district receives 163.8 cm of rainfall which is the highest rainfall measured in the state. Monsoon in this region begins in the last week of June till mid-September. Pre-monsoon showers are expected occasionally in mid-June and post-monsoon rains in the month of October.   The state also receives little rainfall during winters but it receives the heaviest rainfall during July and August and the temperature drops to 35°C.